Patents by Inventor John Witchey

John Witchey has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Frequency and phase locking apparatus
    Patent number: 6118836
    Abstract: A frequency and phase locking apparatus for a phase alignment of a plurality of temporal frames, such as synchronous optical network (SONET) frames, includes a phase locked loop 6 coupled to lock the phase of the first frame, a first frame device 8a capable of receiving the first frame and coupled to provide a synchronous frame frequency to the phase locked loop 6, subsequent frame devices 8b . . . 8n capable of receiving frames subsequent to the first frame, and a drop clock device 22 coupled to the subsequent frame devices 8b . . . 8n to set the phases of the subsequent frames in alignment with the phase of the first frame.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: September 12, 2000
    Assignee: Alcatel USA Sourcing L.P.
    Inventors: Jason W. Dove, John Witchey
  • Method of frequency and phase locking in a plurality of temporal frames
    Patent number: 6088414
    Abstract: A frequency and phase locking method for fine phase locking of a plurality of temporal frames, such as synchronous optical network (SONET) frames, includes the steps of fine phase tracking of the first frame and setting the phases of the subsequent frames in coherence with the phase of the first frame, for example, by a plurality of drop clock signals.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: July 11, 2000
    Assignee: Alcatel USA Sourcing, L.P.
    Inventors: Jason W. Dove, John Witchey